Phosphate Amendments to Compost for Improving P Bio-Availability

IF 2 4区 农林科学 Q3 ECOLOGY
Y. Redel, P. M. Nkebiwe, R. Schulz, T. Müller
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引用次数: 2

Abstract

Abstract This study was conducted to investigate changes in P-fractions, bio-available P (CAL-P), citric acid extractable P, acid phosphatase activity and microbial biomass C and N during incubation of mature biogenic compost (MBC), immature biogenic compost (IBC) or immature sheep manure compost (ISC) not amended with P or amended with rock phosphate (RP, 7.6% P) or triple-superphosphate (TSP, 19.5% P). Incubation was performed at 20 °C in darkness under aerobic conditions. Samples were collected for laboratory analysis at the start of incubation (D-0) and after one, six and 26 days during incubation (D-1, D-6, D-26). Addition of soluble P fertilizer (TSP) led to a threefold increase in all P fractions in comparison to compost without TSP; even a “priming effect” could be observed, promoting conversion of non-labile to labile P. Moreover, addition of TSP lowered biological activity, especially acid phosphatase activity (P-ase), due to already high concentrations of readily available P. In general, P fractions (bicarbonate extractable Pi (NaHCO3-Pi) and bicarbonate extractable Po (NaHCO3-Po) and sodium hydroxide extractable Po (NaOH-Po)) increased during incubation until day 6 at the expense of NaOH-Pi fraction, which decreased. Generally, RP-derived P showed little or no effect on P fractions during the entire incubation period and only led to slightly increased CAL-P and Citric-acid-P levels. Fertilizer effects on labile P fractions were most enhanced with ISC. IBC enhanced microbial growth and P-ase, thereby enhancing conversion of labile into moderate labile NaOH-Po.
堆肥中添加磷酸盐提高磷的生物利用度
摘要本研究旨在研究成熟生物堆肥(MBC)培养过程中P组分、生物有效P(CAL-P)、柠檬酸可提取P、酸性磷酸酶活性和微生物生物量C和N的变化,未成熟生物堆肥(IBC)或未用磷改良或用磷酸岩(RP,7.6%P)或过磷酸钙(TSP,19.5%P)改良的未成熟羊粪堆肥(ISC)。培养在20 在有氧条件下的黑暗中为°C。在培养开始时(D-0)以及1、6和26天后采集样本进行实验室分析 培养期间的天数(D-1,D-6,D-26)。与不添加可溶性磷的堆肥相比,添加可溶性磷使所有磷组分增加了三倍;甚至可以观察到“启动效应”,促进不稳定P向不稳定P的转化。此外,TSP的添加降低了生物活性,特别是酸性磷酸酶活性(P-ase),这是由于现成的P的浓度已经很高。一般来说,P组分(碳酸氢盐可提取的Pi(NaHCO3 Pi)和碳酸氢根可提取的Po(NaHCO3 Po)以及氢氧化钠可提取的P0(NaOH-Po))在培养至第6天期间增加,而NaOH-Pi组分减少。通常,RP衍生的P在整个培养期内对P组分几乎没有影响,仅导致CAL-P和柠檬酸-P水平略有增加。ISC对不稳定磷组分的施肥效果最为显著。IBC增强了微生物的生长和P-ase,从而增强了不稳定的NaOH-Po向中等不稳定的NaOH的转化。
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来源期刊
Compost Science & Utilization
Compost Science & Utilization 农林科学-生态学
CiteScore
4.10
自引率
0.00%
发文量
0
审稿时长
>36 weeks
期刊介绍: 4 issues per year Compost Science & Utilization is currently abstracted/indexed in: CABI Agriculture & Environment Abstracts, CSA Biotechnology and Environmental Engineering Abstracts, EBSCOhost Abstracts, Elsevier Compendex and GEOBASE Abstracts, PubMed, ProQuest Science Abstracts, and Thomson Reuters Biological Abstracts and Science Citation Index
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